code: def test_augmenter_n_output_thread(self):
      n = 3
      for aug in self.audio_augs:
          augmented_audios = aug.augment(
              [self.audio] * 2, n=n, num_thread=n
          )
          self.assertGreater(len(augmented_audios), 1)
          for augmented_audio in augmented_audios:
              self.assertFalse(
                  np.array_equal(augmented_audio, self.audio)
              )
  
file_path: nlpaug/test/augmenter/test_audio_augmenter.py
imports: import unittest
  import os
  import numpy
  from dotenv import load_dotenv
  import nlpaug.augmenter.audio
  from nlpaug.util.audio import AudioLoader
label_desc: Use image node_id 3 for calling the TestAudioAugmenter obj's underlying member method code with example usage: obj.test_augmenter_n_output_thread() without return types